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42 TRG-TRC014-EN
notes
period three
System Configurations
If the heat loss of the perimeter space exceeds 450 Btu/hr per linear foot [430 W
per linear meter] of outside wall, an under-the-window, or baseboard, heating
system is typically used. With this much heat loss, supplying a high quantity of
warm air from overhead diffusers can cause downdrafts, leading to occupant
discomfort.
The cooling requirements of these perimeter spaces are served by a cooling-
only terminal unit. The diffusers are located in the center of the room in order to
evenly supply cool air to the space.
During heating mode, the terminal unit provides minimum airflow to the space
to meet the ventilation requirement. The perimeter heat source is separate, but
can be controlled by the VAV terminal unit controller. Having only one
controller for the space ensures proper sequencing of the cooling and heating
systems.
cooling
cooling
-
-
only
only
VAV terminal unit
VAV terminal unit
Baseboard Perimeter Heating
baseboard
baseboard
heating system
heating system
heat loss > 450 Btu/hr/ft
heat loss > 450 Btu/hr/ft
[430 W/m][430 W/m]
[430 W/m]
Figure 58